[PATCH v5 2/3] platform/x86: int3472: Call "reset" GPIO "enable" for INT347E

[Sakari Ailus <sakari.ailus@linux.intel.com>]

The DT bindings for ov7251 specify "enable" GPIO (xshutdown in
documentation) but the int3472 indiscriminately provides this as a "reset"
GPIO to sensor drivers. Take this into account by assigning it as "enable"
with active high polarity for INT347E devices, i.e. ov7251. "reset" with
active low polarity remains the default GPIO name for other devices.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/platform/x86/intel/int3472/discrete.c | 47 +++++++++++++++++--
 1 file changed, 43 insertions(+), 4 deletions(-)

diff --git a/drivers/platform/x86/intel/int3472/discrete.c b/drivers/platform/x86/intel/int3472/discrete.c
index 3f7624714869..529ea2d08a21 100644
--- a/drivers/platform/x86/intel/int3472/discrete.c
+++ b/drivers/platform/x86/intel/int3472/discrete.c
@@ -2,6 +2,7 @@
 /* Author: Dan Scally <djrscally@gmail.com> */
 
 #include <linux/acpi.h>
+#include <linux/array_size.h>
 #include <linux/bitfield.h>
 #include <linux/device.h>
 #include <linux/gpio/consumer.h>
@@ -122,10 +123,48 @@ skl_int3472_gpiod_get_from_temp_lookup(struct int3472_discrete_device *int3472,
 	return desc;
 }
 
-static void int3472_get_func_and_polarity(u8 type, const char **func,
-					  unsigned long *gpio_flags)
+/**
+ * struct int3472_gpio_map - Map GPIOs to whatever is expected by the
+ * sensor driver (as in DT bindings)
+ * @hid: The ACPI HID of the device without the instance number e.g. INT347E
+ * @type_from: The GPIO type from ACPI ?SDT
+ * @type_to: The assigned GPIO type, typically same as @type_from
+ * @func: The function, e.g. "enable"
+ * @polarity_low: GPIO_ACTIVE_LOW true if the @polarity_low is true,
+ * GPIO_ACTIVE_HIGH otherwise
+ */
+struct int3472_gpio_map {
+	const char *hid;
+	u8 type_from;
+	u8 type_to;
+	bool polarity_low;
+	const char *func;
+};
+
+static const struct int3472_gpio_map int3472_gpio_map[] = {
+	{ "INT347E", INT3472_GPIO_TYPE_RESET, INT3472_GPIO_TYPE_RESET, false, "enable" },
+};
+
+static void int3472_get_func_and_polarity(struct acpi_device *adev, u8 *type,
+					  const char **func, unsigned long *gpio_flags)
 {
-	switch (type) {
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(int3472_gpio_map); i++) {
+		if (*type != int3472_gpio_map[i].type_from)
+			continue;
+
+		if (!acpi_dev_hid_uid_match(adev, int3472_gpio_map[i].hid, NULL))
+			continue;
+
+		*type = int3472_gpio_map[i].type_to;
+		*gpio_flags = int3472_gpio_map[i].polarity_low ?
+			GPIO_ACTIVE_LOW : GPIO_ACTIVE_HIGH;
+		*func = int3472_gpio_map[i].func;
+		return;
+	}
+
+	switch (*type) {
 	case INT3472_GPIO_TYPE_RESET:
 		*func = "reset";
 		*gpio_flags = GPIO_ACTIVE_LOW;
@@ -218,7 +257,7 @@ static int skl_int3472_handle_gpio_resources(struct acpi_resource *ares,
 
 	type = FIELD_GET(INT3472_GPIO_DSM_TYPE, obj->integer.value);
 
-	int3472_get_func_and_polarity(type, &func, &gpio_flags);
+	int3472_get_func_and_polarity(int3472->sensor, &type, &func, &gpio_flags);
 
 	pin = FIELD_GET(INT3472_GPIO_DSM_PIN, obj->integer.value);
 	if (pin != agpio->pin_table[0])
-- 
2.39.5